Vehicle start-up permission device and identification code regis

Details Vehicle start-up permission device and identification code regis Vehicle start-up permission device and identification code regis

1997-06-04

1999-03-23

Elms, Richard T.

Electrical transmission or interconnection systems

Vehicle mounted systems

Automobile

180287, B60R 2504

Patent

active

058864210

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a vehicle start-up permission device which permits the start-up of an engine when an identification code read from a transmitter-receiver coincides with a previously set identification code and to an identification code registering method in which a transmitter-receiver code for specifying the transmitter-receiver and a vehicle code for specifying a vehicle are registered, as identification codes, in the transmitter-receiver and the vehicle start-up permission device, respectively.


BACKGROUND OF THE INVENTION

In order to improve security, it has been recently suggested that, in a vehicle, an electronic key be used in which, for example, a transmitting circuit is integrated with a mechanical key. In this structure, an identification code is transmitted from an electronic key in a state of being inserted in an ignition switch, and when the identification code transmitted from the electronic key coincides with a previously set identification code, the electronic key is judged to be true and, based on this, an engine is caused to start up in accordance with a turning operation of the electronic key.
However, in the above-described conventional structure, the identification code itself is transmitted from the electronic key, and therefore, it is possible to read the identification code stored in the electronic key.


SUMMARY OF THE INVENTION

The present invention has been achieved in view of the above-described circumstances and an object thereof is to provide a vehicle start-up permission device in which an identification code stored in a transmitter-receiver can be also kept secret, and to provide an identification code registering method in which respective identification codes stored in the transmitter-receiver and in the vehicle start-up permission device are kept secret and are registered both in the transmitter-receiver and in the vehicle start-up permission device.
The present invention is an identification code registering method in which a vehicle code for specifying a vehicle and a transmitter-receiver code for specifying a transmitter-receiver are respectively registered in the transmitter-receiver and in a vehicle start-up permission device which permits start-up of an engine when an identification code read from the transmitter-receiver coincides with a previously registered identification code, the method comprising the steps of: (A) registering the transmitter-receiver code and the vehicle code in the transmitter-receiver and the vehicle start-up permission device, respectively; (B) transmitting a random number code prepared on the basis of a predetermined procedure in the vehicle start-up permission device, converting by predetermined encryption processing the transmitter-receiver code to a return code on the basis of the random number code received by the transmitter-receiver to transmit the return code, restoring the return code received by the vehicle start-up permission device to the transmitter-receiver code on the basis of the transmitted random number code, and registering the transmitter-receiver code in the vehicle start-up permission device; and (C) in the vehicle start-up permission device, converting by predetermined encryption processing the vehicle code to a random number vehicle code on the basis of the random number code and transmitting the random number vehicle code, restoring the random number vehicle code received by the transmitter-receiver to the vehicle code on the basis of the random number code, and registering the vehicle code in the transmitter-receiver.
In accordance with the present invention, the identification codes are respectively registered in the transmitter-receiver and the vehicle start-up permission device, which codes being provided to specify the transmitter-receiver and the vehicle start-up permission device, and thereafter, the vehicle code and the transmitter-receiver code can be registered in the transmitter and the vehicle start-up permission device, respectively. For this reason, it becomes unnec

REFERENCES:
patent: 5055701 (1991-10-01), Takeuchi
patent: 5600723 (1997-02-01), Woodall et al.
patent: 5670933 (1997-09-01), Hayashi et al.

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